Do you want to spend more amazing moments with your iPhone? Then the latest MiLi PowerSpring 4 Extended Battery is for you! It allows you to enjoy long hours of internet surfing, watching movies, listening to music, and making phone calls without having to worry about battery shortage. With additional energy, you can make full use of your iPhone’s vibrant features. This device can extend play time on videos for up to 5.4 hours, and playing audios up to 19 hours. Internet surfing and standby are also extended for up to 3.9 hours.

What’s great about the MiLi PowerSpring is, it carries a 1-year warranty. As its name implies, this device comes with a powerful yet handy power-spring action for a safe, easy, and stylish use of your iPhone 4. This is also considered as the world’s thinnest iPhone 4 battery pack and charger that doubles the life of the battery. Because of its sleek form and fitting design, the PowerSpring fits right in your pocket. Its lightweight yet sturdy case mixes together with functionality and style into a rechargeable, functional, and smart battery.